polytechnic (EEE) 1st year, 1st Sem, Electrical & Electronics Engg Materials

Electrical and Electronics Engineering Materials

(Common with Diploma in Electrical Engineering)

Units

1. Classification
2. Conducting materials
3. Insulating materials
4. Magnetic materials
5. Semi-conductor materials
6. Special purpose materials

DETAILED CONTENTS

Classification

Classification of materials into conducting semiconducting and insulating materials with reference to their atomic structure.

Conducting Materials

1. Resistivity and Factors affecting resistivity, such as temperature, alloying and mechanical stressing.
2. Super conductivity and super conducting material.
3. Lower resistivity materials e.g, Copper, aluminum and steel, their general properties, as conductor e.g. resistivity, temperature co-efficient, mechanical properties, corrosion, solar ability, contact resistance and practical application. Uses of mercury.
4. Comparison of copper, aluminum and steel for various application as electrical conductor.
5. Low resistivity copper alloys brass, bronze (cadmium and beryllium), their practical application.
6. High resistivity materials:- Manganin, Constantan, Nichrome, Carbon, Tungsten, their practical application.
7. Electric lamp materials.
8. Brush contact materials.
9. Soldering materials.
10. Thermocouple materials, Fuse materials.

Insulating Materials

1. Introduction
2. Properties of insulating material
   • Electrical properties: Volume resistivity, Surface resistivity, Dielectric Loss, Dielectric Contact, Dielectric strength.
   • Mechanical properties:- Hygroscopicity tensile and compressive strength, Abrasive resistance brittleness.
   • Thermal properties:- Heat resistance, Classification according to high permissible temperature rise, Effect of over loading on the life of an electrical appliances, increase in rating with the use of insulating materials having higher thermal stability. Thermal conductivity.
   • Chemical properties:- Solubility, Chemical resistance, Weather ability.
3. Insulating materials and their application:-
   • Definition and classification
   • Thermosetting materials e.g. Phenol Formaldehyde, Resins (i.e. Bakelite), Amino resins (Urea Formaldehyde and Melamine Formaldehyde), Epoxy resins their properties, Applications and Commercial names.
   • Thermoplastic materials e.g. polyvinyl chloride (P.V.C.), poly Ethylene silicons their properties application and commercial names. Brief description of extrusion and Molding process of using plastic materials in electrical engineering.
   • Nature Insulating Materials:- Mica and Mica products, Asbestos and Asbestos products, Ceramic materials (Porcelain and Steatite), Glass and Glass products, Cotton, Silk, Jute, Paper (Dry and Impregnated), Rubber Bitumen, Mineral and Insulating oil for Transformer, Switch gear, Capacitor, high voltage cables, Insulating Varnishes for Coating and impregnation, Enamels for winding wires, Glass Fiber sleeves.
   • Gaseous Materials e.g. Air, Hydrogen, Nitrogen and SF6.

Magnetic Materials

1. Classification of magnetic materials into soft and hard magnetic materials.
2. Soft  magnetic materials high silicon alloy steel for transformers and low silicon alloy steel, for electrical rotating machine cold rolled grain oriented and non-oriented steel, Nickel iron alloy, soft ferrites, their properties and uses.
3. Hand magnetic materials tungsten steel, chrome steel, cobalt steel, alnico, hard ferrites, their properties and applications.

Semiconductor Materials

Introduction, Semiconductor and their applications, Differential semiconductor materials used in manufacturing various semiconductor (Si & Ge), Material used for electronic components like resister, capacitor, diode, transistors and inductors.

Special Purpose Materials

Materials used in transistor and IC manufacturing, PC BS,computer memory devices (name of such materials to be added)

Ferrous and Non-ferrous materials.

Thermistor sensistor, Resistor and their practical applications.